<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<script src="a.js"></script>
<script src="b.js"></script>
<script>
  let num1=10;

  function  add(num) {
    return num+num1;
  }

  let num1=100;

  function  mul(num) {
    return num*num1;
  }


</script>

<script>
  console.log(add(5))
  console.log(add(10))
</script>
</body>
</html>
